Ellipsoidal universe in the brane world

Details Ellipsoidal universe in the brane world Ellipsoidal universe in the brane world

2007-03-13

arxiv.org/abs/hep-th/0703117v3

JCAP0707:001,2007

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, 1 figure, Version 3, references added, contents expanded

Scientific paper

10.1088/1475-7516/2007/07/001

We study a scenario of the ellipsoidal universe in the brane world cosmology with a cosmological constant in the bulk . From the five-dimensional Einstein equations we derive the evolution equations for the eccentricity and the scale factor of the universe, which are coupled to each other. It is found that if the anisotropy of our universe is originated from a uniform magnetic field inside the brane, the eccentricity decays faster in the bulk in comparison with a four-dimensional ellipsoidal universe. We also investigate the ellipsoidal universe in the brane-induced gravity and find the evolution equation for the eccentricity which has a contribution determined by the four- and five-dimensional Newton's constants. The role of the eccentricity is discussed in explaining the quadrupole problem of the cosmic microwave background.

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